Dynamical complexities in a tri-trophic hybrid food chain model with Holling type II andCrowley–Martin functional responses

摘要

We study how predator behavior in.uences community dynamics of predator-prey systems. It turns out that predator behavior plays a dominant role in communitydynamics. The hybrid model studied in this paper reveals that period-doublingand period-doubling reversals can generate short-term recurrent chaos (STRC), whichmimics chaotic dynamics observed in natural populations. STRC manifests itself whendeterministic changes in a system parameter interrupt chaotic behavior at unpredictableintervals. Numerical results reinforce an earlier suggestion that period-doubling reversalscould control chaotic dynamics in ecological models. In ecological terms, the prey andintermediate predator populations may go to extinction in the event of a catastrophe.The top predator is always a survivor. In contrast to this, this is not the case when theconstituent populations are interacting through Holling type II functional response. Eventhis top predator can go to extinction in the event of such catastrophes